IF Person A is proven and kills person B (person B happens to be inno) who just killed a detective and then within seconds of each other, Person A is killed by person C (who is inno), can person C be slain?
No because person A still committed a traitorous act by killing person B. Person C was just killing a player for killing another, therefore no slays given.
So why bother helping out detectives if you're an inno? Besides the obvious reason of "proven", if the detective happens to die and you killed another player as person C, D, E, F, walks in.
There are reasons that RDM trains don't result in more that one slay. Person B may get a slay for killing the detective, but everyone else was just killing someone they saw kill another inno. This is why RDMs are so bad is that even one on accident can result in half the innos on the server killing each other. Also, there's no guarantee that person C knows that person A is inno, which is why it is discouraged for proven innos to run around with T weapons out, all it takes is one person who didn't see they were proven to see them do a T act and blam
